weboob installation in docker as root un-updatable
https://git.phyks.me/Phyks/flatisfy/blob/master/docker/Dockerfile#L24 and https://git.phyks.me/Phyks/flatisfy/blob/master/docker/fetch.sh#L7 are incompatible as pip run as 'user' can't upgrade something installed as 'root'.